Video: Doepfer A101-1 Vactrol Multitype Filter Review
" I wanted to do this for a while. The thing about the A101-1 is that it can be aggressive and easy. Vactrols are known for their non-distorting response, combined with the Steiner design kinda gives a more tamable beast.
Also, Vactrols behavior is not always precisely predictable because of tolerances in each. Doepfer says:
"mechanical and electrical tolerances cause that each vactrol will behave a bit different (e.g. because of the differences in alignement and distance between LED and LDR, different brightness of the LEDs at the same current)"
This effectively means that A101-1 modules can sound slightly different than each other no matter what calibration is done.."
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